Transmission system for transmitting high-resolution video signal by performing multi-value transmission changing in amplitude direction

1. A transmitter apparatus comprising:

a first multi-value signal generator that converts a non-video signal of aM bits equal to “a” multiplied by “M”, where “a” and “M” are positive integers, into a multi-value signal of a multi-value number 2 aM , and outputs a resulting signal, the non-video signal being different from a video signal;

a control signal generator that generates a control signal indicating one of a blanking time interval and an active time interval, and outputs the control signal;

a selector that selects one of the non-video signal and a zero signal on the basis of the control signal, and sends the selected signal to the first multi-value signal generator;

a second multi-value signal generator that converts the video signal of aN bits equal to “a” multiplied by “N”, where “N” is a positive integer, into a multi-value signal of a multi-value number 2 aN larger than the multi-value number 2 aM , and outputs a resulting signal;

an adder that adds the resulting signal of the first multi-value signal generator and the resulting signal of the second multi-value signal generator, and outputs a resulting signal; and

a transmission driver circuit that receives the resulting signal output from the adder, transmits the multi-value signal of the multi-value number 2 aM in at least a partial time interval of the blanking time interval, and transmits the multi-value signal of the multi-value number 2 aN in the active time interval.

2. The transmitter apparatus as claimed in claim 1 ,

wherein the positive integers “a”, “N”, and “M” are constant, respectively, in a video transmission without changing a video format.

3. The transmitter apparatus as claimed in claim 1 ,

wherein the transmitter apparatus transmits the non-video signal with the multi-value signal of the multi-value number 2 aM in the blanking time interval, and transmits the video signal with the multi-value signal of the multi-value number 2 aN in the active time interval on the basis of the control signal.

4. The transmitter apparatus as claimed in claim 1 ,

wherein the control signal generator further generates a horizontal synchronization signal and a vertical synchronization signal,

the transmitter apparatus includes a switching signal generator that generates a switching signal indicating whether it is the vertical blanking time interval or the interval other than the vertical blanking time interval, and outputs the generated signal, and

the transmitter apparatus transmits the non-video signal with the multi-value signal of the multi-value number 2 aM in the vertical blanking time interval or with the multi-value signal of the multi-value number 2 aN in the time interval other than the vertical blanking time interval, and transmits the video signal with the multi-value signal of the multi-value number 2 aN in the active time interval on the basis of the switching signal.

5. The transmitter apparatus as claimed in claim 1 ,

wherein each electrical potential level of the transmission signal in the blanking time interval is set to be identical to each threshold level to determine each electrical potential level of the transmission signal in the active time interval.

6. The transmitter apparatus as claimed in claim 1 , further comprising:

a coupling capacitor that cuts off the DC component of the transmission signal.

7. The transmitter apparatus as claimed in claim 1 ,

wherein the transmission driver circuit is a differential transmission driver circuit.

8. A receiver apparatus comprising:

a multi-value receiver circuit that receives a transmission signal transmitted by converting a non-video signal of aM bits equal to “a” multiplied by “M”, where “a” and “M” are positive integers, into a multi-value signal of a multi-value number 2 aM in a blanking time interval, the non-video signal being different from a video signal, receives a transmission signal transmitted by converting the video signal of aN bits to “a” multiplied by “N”, where “N” is a positive integer, into a multi-value signal of a multi-value number 2 aN larger than the multi-value number 2 aM in an active time interval, and outputs the received signal as a reception signal;

a comparator circuit that compares an electrical potential level of the reception signal with a plurality of threshold levels, and outputs resulting signals;

a buffer memory circuit that temporarily stores the resulting signals of the comparator circuit;

a multi-value signal detector that determines whether it is a multi-value signal of a multi-value number 2 aM or a multi-value signal of a multi-value number 2 aN from the electrical potential level of the reception signal, and generates a control signal that indicates a determination result; and

a logic circuit that demodulates the multi-value signal of the multi-value number 2 aM and the multi-value signal of the multi-value number 2 aN of the reception signal into the non-video signal of aM bits and the video signal of aN bits, respectively, on the basis of the electrical potential level of the reception signal and the control signal, and outputs a resulting signal.

9. The receiver apparatus as claimed in claim 8 ,

wherein the positive integers “a”, “N”, and “M” are constant, respectively, in a video transmission without changing a video format.

10. The receiver apparatus as claimed in claim 8 ,

wherein the logic circuit demodulates the multi-value signal of the multi-value number 2 aM of the reception signal into the non-video signal of aM bits in the blanking time interval, and demodulates the multi-value signal of the multi-value number 2 aN of the reception signal into the video signal of aN bits in the active time interval.

11. The receiver apparatus as claimed in claim 8 , further comprising:

a synchronization signal detector that detects the horizontal synchronization signal or the vertical synchronization signal by determining whether a signal pattern of the horizontal synchronization signal and a signal pattern of the vertical synchronization signal are included on the basis of the electrical potential level of the reception signal, and outputs the signal to the logic circuit,

wherein the logic circuit demodulates the multi-value signal of the multi-value number 2 aM of the reception signal into the non-video signal of aM bits in the vertical blanking time interval, and demodulates the multi-value signal of the multi-value number 2 aN into the video signal of aN bits in the time interval other than the vertical blanking time interval depending on whether it is the vertical blanking time interval or the time interval other than the vertical blanking time interval on the basis of the horizontal synchronization signal and the vertical synchronization signal.

12. The receiver apparatus as claimed in claim 8 , further comprising: a coupling capacitor that cuts off the DC component of the reception signal.

13. The receiver apparatus as claimed in claim 8 ,

wherein the multi-value receiver circuit is a differential multi-value receiver circuit.

14. A transmission system comprising:

a transmission apparatus; and

a receiver apparatus,

wherein the transmitter apparatus comprises:

a first multi-value signal generator that converts the non-video signal of aM bits equal to “a” multiplied by “M”, where “a” and “M” are positive integers, into a multi-value signal of a multi-value number 2 aM , and outputs a resulting signal, the non-video signal being different from a video signal;

a control signal generator that generates a control signal indicating one of a blanking time interval and an active time interval, and outputs the control signal;

a selector that selects one of the non-video signal and a zero signal on the basis of the control signal, and sends the selected signal to the first multi-value signal generator;

a second multi-value signal generator that converts the video signal of aN bits equal to “a” multiplied by “N”, where “N” is a positive integer, into a multi-value signal of a multi-value number 2 aN larger than the multi-value number 2 aM , and outputs a resulting signal;

an adder that adds the resulting signal of the first multi-value signal generator and the resulting signal of the second multi-value signal generator, and outputs a resulting signal; and

a transmission driver circuit that receives the resulting signal output from the adder, transmits the multi-value signal of the multi-value number 2 aM in at least a partial time interval of the blanking time interval, and transmits the multi-value signal of the multi-value number 2 aN in the active time interval, and

wherein the receiver apparatus comprises:

a multi-value receiver circuit that receives a transmission signal transmitted by converting a non-video signal of aM bits different from a video signal into a multi-value signal of a multi-value number 2 aM in a blanking time interval, receives a transmission signal transmitted by converting the video signal of aN bits into a multi-value signal of a multi-value number 2 aN larger than the multi-value number 2 aM in an active time interval, and outputs the received signal as a reception signal;

a comparator circuit that compares an electrical potential level of the reception signal with a plurality of threshold levels, and outputs resulting signals;

a buffer memory circuit that temporarily stores the resulting signals of the comparator circuit;

a multi-value signal detector that determines whether it is a multi-value signal of a multi-value number 2 aM or a multi-value signal of a multi-value number 2 aN from the electrical potential level of the reception signal, and generates a control signal that indicates a determination result; and

a logic circuit that demodulates the multi-value signal of the multi-value number 2 aM and the multi-value signal of the multi-value number 2 aN of the reception signal into the non-video signal of aM bits and the video signal of aN bits, respectively, on the basis of the electrical potential level of the reception signal and the control signal, and outputs a resulting signal.